How do I remove a tool from one's backpack after use? [closed]

POC: How do I remove a tool from one's backpack after use?

IDEA: For instance, if one finds a key and touches a door, the door will open (transparency = 1, can collide = false), but the key is still in the user's inventory. Also, how do I delete the door rather than typing more lines of code?

NOTES: I was told from a friend that I should use tool:Delete(), but I do not know how to use it because my script does work completely. I've also seen Part:Delete(), but there's always an error that I do not know how to fix.

script.Parent.Touched:connect(function(p) if p.Parent.Name == "CopperKey" then script.Parent.Transparency = 1 script.Parent.CanCollide = false end end)

OVERALL: -How do I write the script when a certain tool touches a brick, the tool deletes itself from the user's inventory? -How do I delete the part?